Expand description
Serde with module for a u128 field that is buffered through serde’s
Content enum — i.e. a field of an internally-tagged (#[serde(tag = "…")])
enum or struct.
Same JS-safety as json_safe_u128 (values above Number.MAX_SAFE_INTEGER
stringify in human-readable JSON), but it never emits serialize_u128.
serde’s Content enum cannot hold a 128-bit integer in this serde version, so
json_safe_u128’s serialize_u128 round-trips to an “invalid type: integer …
as u128” error once internal tagging buffers it. This variant instead encodes a
plain number while the value fits in u64, and a string once it doesn’t (and,
in human-readable JSON, once it exceeds Number.MAX_SAFE_INTEGER). The
Value / bincode paths keep the value lossless via the same number/string split.